Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 407 · 40 questions

How to do it in your head (Look first): A 9, 19 or 99 → round and adjust. Two close numbers → count up (or near doubles when adding). × or ÷ by 4 or 8 → double or halve; other sums → split into tens and ones.

1. 1.Best estimate of 36 × 88? (a) 360 (b) 3600 (c) 36000
2. 2.22 + ? = 100
3. 3.28 + 23 =
4. 4.You start your homework at 1:05 and finish at 2:20. How many minutes did you work?
5. 5.18 + 6 =
6. 6.13 × 8 =
7. 7.212 ÷ 4 =
8. 8.Best estimate of 40 × 79? (a) 3200 (b) 32000 (c) 320
9. 9.5 + ? = 10
10. 10.Best estimate of 454 + 718? (a) 1000 (b) 1200 (c) 1400
11. 11.26 × 6 =
12. 12.You buy a box of crayons for ₹383 and pay with a ₹500 note. How much change do you get, in rupees?
13. 13.Best estimate of 714 + 176? (a) 700 (b) 1100 (c) 900
14. 14.Best estimate of 56 × 61? (a) 3600 (b) 360 (c) 36000
15. 15.A train leaves at 5:25 and reaches the next city at 7:10. How many minutes is the journey?
16. 16.What is the remainder when 31 is divided by 3?
17. 17.27 + 26 =
18. 18.41 + ? = 100
19. 19.Half of 180 =
20. 20.66 + 51 =
21. 21.What is the remainder when 79 is divided by 8?
22. 22.Double 94 =
23. 23.67 + 9 =
24. 24.10% of ₹170 =
25. 25.Half of 90 =
26. 26.7 + ? = 10
27. 27.13² =
28. 28.You buy a water bottle for ₹26 and a pen for ₹17. You pay with a ₹100 note. How much change do you get, in rupees?
29. 29.78 + 3 =
30. 30.73 − 39 =
31. 31.50% of ₹100 =
32. 32.96 ÷ 4 =
33. 33.72 × 4 =
34. 34.12² =
35. 35.10% of ₹630 =
36. 36.83 + 58 =
37. 37.What is the remainder when 17 is divided by 3?
38. 38.18 + 9 =
39. 39.1005 − 988 =
40. 40.10% of ₹310 =

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